No, plants (on land) and algae (in water) are autotrophs.
plants
An autotroph is an organism that can produce organic compounds out of non-living energy. Examples of autotrophs on land are the corpse lily, Venus fly trap and the ball moss.
A potato is an autotroph.
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Autotroph is not a verb and therefore does not have a past tense. Autotroph is a noun.
autotroph, because it creates energy by itself from basic parts, using sun energy and CO2.
kingdom archaebacteria is both heterotroph and autotroph